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Iron deficiency anemia  causing blue skin under the eyes. If there is a shortage of iron in the body, oxygen cannot be properly transported by the blood. Hemoglobin is the oxygen transporting component in the blood, moving oxygen from the lungs to the cells where it is released for normal cell metabolism.
Severe biotin deficiency can lead to loss of hair, eyelashes, and eyebrows. Also known as Vitamin H or B7, Biotin is found in food sources such as egg yolk, kidney, liver, yeast, and milk. Also known as Vitamin H or B7, Biotin is found in food sources such as egg yolk, kidney, liver, yeast, and milk.herefore, the most visible sign of copper deficiency is loss of hair color. Also copper deficiency is linked to anemia which causes hair thinning and breakage. Dietary sources of copper include shellfish such as oysters, liver, beans, prunes, black pepper, whole grains, nuts, potatoes, and cocoa.